US4600877A - Arrangement in transformers - Google Patents

Arrangement in transformers Download PDF

Info

Publication number
US4600877A
US4600877A US06/651,943 US65194384A US4600877A US 4600877 A US4600877 A US 4600877A US 65194384 A US65194384 A US 65194384A US 4600877 A US4600877 A US 4600877A
Authority
US
United States
Prior art keywords
transformer
voltage
circuit
switch means
voltage source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/651,943
Other languages
English (en)
Inventor
Rolf Soderholm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kraftelektronik AB
Original Assignee
Kraftelektronik AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kraftelektronik AB filed Critical Kraftelektronik AB
Assigned to KRAFTELEKTRONIK AB reassignment KRAFTELEKTRONIK AB ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SODERHOLM, ROLF
Application granted granted Critical
Publication of US4600877A publication Critical patent/US4600877A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/25—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/257—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
    • H02P13/12—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by varying magnetic bias

Definitions

  • the present invention relates to a transformer having a primary winding which is connectable to an a.c. voltage source via a switch means which opens and closes at a controllable frequency.
  • the object of the present invention is to provide a novel and advantageous arrangement with which the aforediscussed disadvantages are substantially removed.
  • the arrangement according to the invention effectively avoids the occurrence of uncontrolled currents on the primary side of the transformer, rendering it unnecessary to overdimension the transformer while incurring but slight increases in price and in the weight of the transformer.
  • FIG. 1 is a circuit diagram of an arrangement according to the invention.
  • FIG. 2 is a diagram of a circuit used in the arrangement illustrated in FIG. 1.
  • FIG. 3 is a diagram illustrating the voltage/current characteristic of the circuit illustrated in FIG. 2.
  • FIGS. 4 and 5 are respective diagrams illustrating the voltage on the primary side of a transformer, both in the absence of and in the presence of the circuit illustrated in FIG. 2 or the circuit illustrated in FIG. 6.
  • FIG. 6 is a circuit diagram similar to that shown in FIG. 1, but incorporating a circuit designed in accordance with a second embodiment.
  • FIG. 7 illustrates the circuit arrangement coupled in parallel with the secondary winding.
  • the reference 10 generally identifies a transformer which includes a primary winding 11 and a secondary winding 12.
  • the primary winding 11 is connected to an a.c. voltage source 13 via a switch means, generally shown at 14, which can open and close the connection between the voltage source 13 and the primary winding 11 at a controllable frequency, in a known manner.
  • the switch means 14 comprises a thyristor regulator, comprising two anti-parallel connected thyristors 15 and a control device 16, with which desired interval between ignition of the two thyristors 15 and desired ignition angle can be set.
  • the secondary winding 12 is connected to a load 17, represented in the illustrated embodiment by a resistance 18, two zener diodes 19 connected in series-opposition and a capacitance 20 connected in parallel with the zener diodes 19.
  • FIG. 2 A principle design of the circuit 21, chosen by way of example, is illustrated in FIG. 2, according to which said circuit 21 includes a control circuit-part 22, a main circuit-part 23, and a rectifying bridge 24.
  • the control circuit-part 22 incorporates a transistor 25 in series with a large resistance 26, e.g. in the order of 45 k ⁇ , connected to the collector of said transistor.
  • a large resistance 26 e.g. in the order of 45 k ⁇
  • Connected in parallel with the transistor 25 and the resistance 26 are two resistances 27, 28 of which the first resistance 27 is much greater than any of the resistances 26 and 28, for example about ten times greater than the resistance 26, and of which the other resistance 28 constitutes, for example, about one third of the resistance 26.
  • the base of the transistor 25 is connected to a point between the resistances 27, 28.
  • the main circuit-part 23 includes a transistor 29 in series with a resistance 30 connected to the emitter thereof.
  • the resistances 26, 27, 28 and the transistors 25, 29 are so adapted to one another that current will flow through the transistor 29 and resistance 30 of the main circuit-part 23, when the voltage on the input of circuit 21, i.e. the voltage across the primary winding 11 of the transformer, lies beneath the aforesaid voltage valve.
  • this voltage value is exceeded, the voltage on the base of the transistor 25 increases sufficiently for the lastmentioned transistor to become conductive and the transistor 29 of the main circuit-part to cease to be conductive.
  • the arrangement of the circuit 21 effectively prevents re-magnetization of the transformer 10 when the thyristors 15 are not conductive, thereby to prevent the transformer from becoming saturated.
  • FIG. 4 illustrates possible voltage conditions on the primary side of the transformer 10 in the absence of circuit 21, when the thyristors 15 are ignited alternately only each third half period, and the ignition angle is such that voltage is only applied to the primary winding 11 of the transformer 10 during a minor part of the duration of these half periods.
  • U 1 identifies the output voltage of the voltage source 13, while U 2 identifies the voltage across the primary winding 11.
  • the voltage passes through the O-line in an undesirable manner, and falls back thereto at a latter point in time.
  • a new half cycle is commenced at P2, and the voltage U 2 then, at point P3 again passes through the O-line in an undesirable manner, and lies above said line until the completion of the cycle at point P4.
  • a transformer is normally dimensioned so that it can take up the voltage-time-area lying between the zero line and a half period, i.e. the area C.
  • FIG. 5 illustrates the voltage conditions on the primary side of the transformer 10, when the arrangement incorporates the circuit 21.
  • the references U 1 , U 2 , P1-P4 used in FIG. 5 have the same significance as those in FIG. 4.
  • the circuit 21 is instrumental in substantially locking the voltage U 1 across the primary winding 11 of the transformer to the O-line at points P1 and P3.
  • FIG. 6 illustrates the arrangement of FIG. 1 provided with an alternative circuit 21 which during the time when the switch means 14 is open, not only maintains magnetization of the transformer 10 in a direction opposite to the direction of magnetization which results from the subsequent closing of the switch means, but also generates a current which magnetizes the transformer.
  • the magnetizing circuit illustrated in FIG. 6 includes two, suitably regulatable current sources 31, 32, each of which is connected with a respective transistor 33, 34.
  • the two current sources are also connected in series with a current-limiting resistance 35, which is also suitably regulatable, and with the primary winding 11 of the transformer 10.
  • the two current sources 31, 32 are opposed to one another, so as to generate a current through the winding 11 in one direction or the other, when the associated transistor 33 or 34 becomes conductive.
  • Each of the bases of the transistor 33, 34 is connected to a respective output of an RS-flip-flop 36, via electronic switches 37, 38.
  • the flip-flop 36 is triggered to produce voltage on either the Q-output or the Q-output, by means of the signals applied to the gates of the thyristor 15, and the voltage from those two outputs can cause associated transistors 33, 34 to conduct, provided that the switches 37, 38 are closed.
  • the switches 37, 38 are operated by means of an actuating circuit which includes a current transformer 39, which is arranged on the primary side of the transformer 10 in the manner shown and which is connected, via a rectifying bridge 40, to a level flip-flop 41, which goes high and holds the switches 37, 38 closed, provided that no current flows through the current transformer 39.
  • FIG. 7 shows high/low impedance circuit 21 coupled in parallel to the secondary (designated S) of transformer 10.
  • the circuit 21 can be connected across the secondary winding 12 of the transformer, or across both windings 11 and 12, and inductances can also be used on the primary and/or secondary side of the transformer, in combination with the circuit 21.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ac-Ac Conversion (AREA)
  • Coils Or Transformers For Communication (AREA)
US06/651,943 1983-09-22 1984-09-19 Arrangement in transformers Expired - Fee Related US4600877A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8305137A SE8305137L (sv) 1983-09-22 1983-09-22 Anordning vid transformator
SE8305137 1983-09-22

Publications (1)

Publication Number Publication Date
US4600877A true US4600877A (en) 1986-07-15

Family

ID=20352613

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/651,943 Expired - Fee Related US4600877A (en) 1983-09-22 1984-09-19 Arrangement in transformers

Country Status (5)

Country Link
US (1) US4600877A ( )
EP (1) EP0140851B1 ( )
AU (1) AU3342584A ( )
DE (1) DE3467477D1 ( )
SE (1) SE8305137L ( )

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4745300A (en) * 1986-05-03 1988-05-17 Gebhard Balluff Fabrik Feinmechanischer Erzeugnisse Gmbh & Co. Two-wire switch
US4868486A (en) * 1986-06-06 1989-09-19 Koito Manufacturing Co., Ltd. AC power control apparatus
AU700290B2 (en) * 1995-06-07 1998-12-24 Nicollet Technologies Corporation Phase control circuit having independent half cycles

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3524563A1 (de) * 1985-07-10 1987-01-15 Marquardt Gmbh Schaltanordnung zur vollwellen-leistungssteuerung
US5004957A (en) * 1989-01-06 1991-04-02 Lee Colortran, Inc. Dimming control circuit
BE1011524A3 (nl) * 1997-10-31 1999-10-05 Niko Naamloze Vennootschap Resistieve schakeling voor een elektronische diminrichting.
RU2613340C2 (ru) * 2015-08-19 2017-03-16 Борис Алексеевич Аржанников Устройство для регулирования напряжения и способ его регулирования
RU2689111C1 (ru) * 2018-06-21 2019-05-24 Борис Алексеевич Аржанников Устройство для регулирования напряжения

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4016482A (en) * 1975-10-31 1977-04-05 International Business Machines Corporation Pulse energy suppression network
US4441146A (en) * 1982-02-04 1984-04-03 Vicor Corporation Optimal resetting of the transformer's core in single ended forward converters

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1161834A (en) * 1967-01-20 1969-08-20 Westinghouse Brake & Signal Improvements relating to Alternating Current Regulator Circuits.
DE3021930A1 (de) * 1979-06-13 1980-12-18 Dionex Corp Netzgeraet

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4016482A (en) * 1975-10-31 1977-04-05 International Business Machines Corporation Pulse energy suppression network
US4441146A (en) * 1982-02-04 1984-04-03 Vicor Corporation Optimal resetting of the transformer's core in single ended forward converters

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4745300A (en) * 1986-05-03 1988-05-17 Gebhard Balluff Fabrik Feinmechanischer Erzeugnisse Gmbh & Co. Two-wire switch
US4868486A (en) * 1986-06-06 1989-09-19 Koito Manufacturing Co., Ltd. AC power control apparatus
AU700290B2 (en) * 1995-06-07 1998-12-24 Nicollet Technologies Corporation Phase control circuit having independent half cycles

Also Published As

Publication number Publication date
DE3467477D1 (en) 1987-12-17
AU3342584A (en) 1985-03-28
SE8305137L (sv) 1985-03-23
SE8305137D0 (sv) 1983-09-22
EP0140851A1 (en) 1985-05-08
EP0140851B1 (en) 1987-11-11

Similar Documents

Publication Publication Date Title
US3327199A (en) Transistorized high voltage regulated power supply system with temperature compensating means
US4323845A (en) Power regulating apparatus including load current sensor means
US5801458A (en) Direct current control circuit
US4600877A (en) Arrangement in transformers
US6294901B1 (en) Power dimmer
GB2095493A (en) Three state circuit
JPS61500347A (ja) 直列トランジスタ・チヨツパ
US3348128A (en) Phase controlled alternating current power circuits using bidirectional conducting devices
US3792337A (en) D. c. to d. c. converter
US5675476A (en) Phase controlled bridge
Zaltsman Inrush current control for equipment powered by UPSs
SU964929A1 (ru) Двухтактный транзисторный инвертор
SU1580501A1 (ru) Однофазный регул тор напр жени
SU614507A1 (ru) Двухтактный инвертор
SU653699A1 (ru) Магнитно-тиристорный удвоитель частоты
SU920669A1 (ru) Многозвенный импульсный стабилизатор посто нного напр жени
SU547943A1 (ru) Устройство дл переключени отводов трансформатора под нагрузкой
SU575752A1 (ru) Стабилизированный инвертор
SU1408435A1 (ru) Экстремальный регул тор мощности
SU1485281A1 (ru) Модель обмотки возбуждения синхронного генератора
DE1488355C3 (de) Umrichterschaltung mit Gleichstromzwischenkreis und einem selbsterregten Transistor-Wechselrichter in Gegentakt-Schaltung
SU1001362A1 (ru) Преобразователь напр жени
JPS60142712A (ja) 電子式交流電圧可変装置
RU1830176C (ru) Регулируемый двухтактный преобразователь посто нного напр жени
JPH0227912B2 (ja) Chokuryuanteikadengensochi

Legal Events

Date Code Title Description
AS Assignment

Owner name: KRAFTELEKTRONIK AB BOX 2102, S-445 02 SURTE, SWEDE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SODERHOLM, ROLF;REEL/FRAME:004316/0689

Effective date: 19840904

Owner name: KRAFTELEKTRONIK AB,SWEDEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SODERHOLM, ROLF;REEL/FRAME:004316/0689

Effective date: 19840904

FEPP Fee payment procedure

Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY

FPAY Fee payment

Year of fee payment: 4

SULP Surcharge for late payment
REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19940720

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362